The side effect of allelopathy could casue few billions dollars lose to worldly agriculture annually. It's important that its negative and positive influence to agriculture should be studied. A review is given on the types of allelopathy, the mechanism, the affecting factors to allelopathy, and its application in agriculture. Some subjects should be addressed for the agro-forestry systems in the middle and lower reaches of the Yangtze River: study on different crop species for poplar-corps system, sieving "the mutual plants" to utilize in the biological controlling for the longhorn beetle, the autotoxicity of poplar and its influence to the succeeding crops, the effects of poplar on the content of microflora and enzymatic activities in soil.
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